National Dental Examining Board of Canada (NDEB) Practice Exam 2025 - Free NDEB Practice Questions and Study Guide

One possible explanation is that the stage of tooth eruption determines the success of pit and fissure sealants because these sealants are intended to be applied on the occlusal surface of permanent teeth with deep grooves and pits, which are susceptible to decay. If the sealant is applied before the tooth fully erupts, it may not completely cover the grooves and pits, leaving them vulnerable to decay. On the other hand, if the sealant is applied after the tooth has fully erupted, it may not adhere properly to the smooth and polished surface of the tooth, reducing its effectiveness. Therefore, the stage of tooth eruption is a critical factor in ensuring the efficacy of pit and fissure sealants.

Options A, B, and D are not directly related to the effectiveness of pit and fissure sealants. While fluoride in water and good oral hygiene can help prevent tooth decay, they